Impact Soil Tester

Heavy Clegg Hammer

The 20 kg "Heavy" Clegg Hammer was developed for testing on the running course of flexible pavements. Its hammer diameter is 13 cm meaning that it is also tests through a larger zone than other Clegg Hammers. Its larger mass and diameter means a reduction in output sensitivity enabling testing of materials harder than 100 CIV (i.e. the output of the Standard Clegg Hammer). Because of its weight, the Heavy Clegg Hammer has a guide tube with wheels and a pull-handle to ease moving around the site. The weight of the guide tube is around 17 kg and the shipping case weighs around 18 kg for a combined total shipping weight for the 20kg Clegg Hammer of 55kg. Case dimensions are 38 cm by 49 cm by 86 cm. Standard drop-height for the Heavy Clegg Hammer is 30 cm. Notation for the output at the fourth drop is CIV/H for "Heavy Clegg Impact Value" when the 20 kg Clegg Hammer is dropped from its standard height of 30 cm, where the output is in Clegg units, i.e. where 1 Clegg unit equals 10 gravity units with the resulting decimal fraction truncated.

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